If there was any doubt how a system would work, filling and dumping from the same feed on the bottom of the boat, I can tell you it works great! barely had to bleed any air out of the sac when filling and when empying, it sucked my sac dry like a raisin! Thanks H20King for helping with this project, and thanks to Gonyeas Marine in Gresham OR for the use of the shop! I have now found the smartest marine mechanic I have ever met yet! (Dave from Gonyeas Marine) is awesome!!